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[Default]

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This option is used to select an instruction-set architecture (RXv1 or RXv2) for use in generating instruction codes.

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When -isa=rxv1 is specified, an instruction code for the RXv1 instruction-set architecture is generated.

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When -isa=rxv2 is specified, an instruction code for the RXv2 instruction-set architecture is generated.

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When neither the -nofpu nor -fpu option has been selected, specifying the -isa option automatically selects the
-fpu option.

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Omitting the -isa option will lead to an error if neither the -cpu option nor one of the environment variables (CPU_RX or ISA_RX) is specified.

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The -isa and -cpu options cannot be specified at the same time.